Where does the hash come from?

[qpotential]

Then why does it say "oclHashcat-plus - advanced password recovery" and "Worlds fastest password cracker"

It is correct.. it doesn't say world's fastest file decrypter.... which is probably what you are after.

No, all I wan't to find is the password so I can decrypt the file using the original encryptor/decryptor software and enter it in the pop-up that asks for the password. This is an ad-hoc educational experience for me after getting interested a couple days ago after seeing the cicada 3301 challenge. I'd like to mess around and learn some stuff but when I can't even get a simple 12345 password from a 4.1KB encrypted notepad file using the "Worlds fastest password cracker", it is highly discouraging.